/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.service.thrift;

import org.apache.iotdb.commons.service.metric.MetricService;
import org.apache.iotdb.commons.service.metric.enums.Metric;
import org.apache.iotdb.commons.service.metric.enums.Tag;
import org.apache.iotdb.metrics.utils.MetricLevel;
import org.apache.iotdb.service.rpc.thrift.IClientRPCService.Iface;
import org.apache.iotdb.service.rpc.thrift.IClientRPCService.Processor;
import org.apache.thrift.ProcessFunction;
import org.apache.thrift.TApplicationException;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.*;

import java.util.concurrent.TimeUnit;

public class ProcessorWithMetrics extends Processor {
    private Iface iface;

    public ProcessorWithMetrics(Iface iface) {
        super(iface);
        this.iface = iface;
    }

    @Override
    public void process(TProtocol in, TProtocol out) throws TException {
        TMessage msg = in.readMessageBegin();
        long startTime = System.currentTimeMillis();
        ProcessFunction fn = (ProcessFunction) getProcessMapView().get(msg.name);
        if (fn == null) {
            TProtocolUtil.skip(in, TType.STRUCT);
            in.readMessageEnd();
            TApplicationException x =
                    new TApplicationException(
                            TApplicationException.UNKNOWN_METHOD, "Invalid method name: '" + msg.name + "'");
            out.writeMessageBegin(new TMessage(msg.name, TMessageType.EXCEPTION, msg.seqid));
            x.write(out);
            out.writeMessageEnd();
            out.getTransport().flush();
        } else {
            fn.process(msg.seqid, in, out, iface);
        }
        long cost = System.currentTimeMillis() - startTime;
        MetricService.getInstance()
                .timer(
                        cost,
                        TimeUnit.MILLISECONDS,
                        Metric.ENTRY.toString(),
                        MetricLevel.IMPORTANT,
                        Tag.NAME.toString(),
                        msg.name);
    }
}
